19-07-2020, 08:50 PM
(This post was last modified: 19-07-2020, 08:51 PM by Murphyv310.)
Hi Rob.
Well you can comfortably say its NOT the EZ81 that is the problem. Unless the reading across pins 1 & 7 of the EZ is very high or O/C then you can discount the PSU.
Next is to fit V3 back in (without V1 & 2 in circuit) and tell me if the hum returns, also see if VR1 and VR2 changes the level of the hum.
Well you can comfortably say its NOT the EZ81 that is the problem. Unless the reading across pins 1 & 7 of the EZ is very high or O/C then you can discount the PSU.
Next is to fit V3 back in (without V1 & 2 in circuit) and tell me if the hum returns, also see if VR1 and VR2 changes the level of the hum.
